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  • 借助form表单向web服务器发送消息

    form表单是常用的,在网页浏览器中 用户点击的请求经htto协议发送回web容器,请求处理

    建立用户的页面

     1 <!DOCTYPE html>
     2 <html>
     3 <head>
     4 <meta charset="UTF-8">
     5 <title>Insert title here</title>
     6 </head>
     7 <body>
     8 <h3>beer select</h3>
     9     <form method="post" action="SelectBeer.do">
    10     Selection beer charectar <p>
    11     Color:
    12     <select name="color" size="1">
    13     <option>red
    14     <option>blue
    15     <option>gray
    16     <option>yellow
    17     </select>
    18     <br>
    19     <br>
    20     <center>
    21     <input type="submit">
    22     </center>
    23     </form>
    24 </body>
    25 </html>

    servlet处理的内容,此处用doPost()方法,只展示覆写的doPost()内容

    1 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    2         // TODO Auto-generated method stub
    3         //doGet(request, response);
    4         response.setContentType("text/html");
    5         PrintWriter out = response.getWriter();
    6         out.println("beer selection Adivce<br>");
    7         String c= request.getParameter("color");
    8         out.print("<br>got beer "+c);
    9     }

    配置web.xml文件,这里是将.do的逻辑符配置给服务器

     1 <servlet>
     2     <description></description>
     3     <display-name>BeerSelect</display-name>
     4     <servlet-name>BeerSelect</servlet-name>
     5     <servlet-class>BeerSelect</servlet-class>
     6   </servlet>
     7   <servlet-mapping>
     8     <servlet-name>BeerSelect</servlet-name>
     9     <url-pattern>/SelectBeer.do</url-pattern>
    10   </servlet-mapping>

     编译文件,重启tomcat服务器,得到允许结果

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  • 原文地址:https://www.cnblogs.com/zhangqiuchi/p/6741151.html
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